Preparation method of LiFePO4/GO/Mx+/C composite

A composite material and material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problem that lithium iron phosphate cannot improve electronic conductivity and ion diffusion rate, cannot solve the physical and chemical properties of nano-scale particles, and pollutes the environment. Employee health and other problems, to achieve the effect of high rate charge and discharge performance, low production material cost, and high electronic conductivity

Active Publication Date: 2016-09-07
湖南锂顺能源科技有限公司
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Problems solved by technology

[0006] Chinese patent 201110083171.1 discloses a preparation method of lithium iron phosphate / graphene composite positive electrode material. In the process of preparing lithium iron phosphate / graphene composite positive electrode material, phosphates such as ammonium dihydrogen phosphate, ammonium phosphate, phosphoric acid Diammonium hydrogen will produce a large amount of ammonia gas, which will pollute the environment and be harmful to the health of operators; in addition, coating graphene on the surface of lithium iron phosphate precursor by gas phase method can only solve the surface physical and chemical properties of micron-sized agglomerated particles , can not solve the physical and chemical properties of nano-scale particles agglomerated into micron
The lithium iron phosphate prepared by this method cannot improve the electronic conductivity and ion diffusion rate from the inside of the material, and it is difficult for graphene to uniformly coat the surface of the lithium iron phosphate precursor

Method used

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  • Preparation method of LiFePO4/GO/Mx+/C composite
  • Preparation method of LiFePO4/GO/Mx+/C composite
  • Preparation method of LiFePO4/GO/Mx+/C composite

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of GO / Mg 2+ Material

[0030] Accurately weigh 6.0kg of water-based single-layer graphene emulsion with a particle size of 120-160nm 5%wt, 58.4g of magnesium hydroxide, and emulsify in the emulsification equipment for 1h. During the process, the temperature of the material is controlled at 50°C. Dry at a constant temperature of 330°C in a spray drying equipment protected by an inert gas.

[0031] (2) Preparation of LiFePO 4 / GO / Mg 2+ Material

[0032] After accurately weighing 5.9kg of lithium carbonate, 8.0kg of ferrous oxalate, 3.7kg of phosphoric acid, and 32.0kg of deionized water, mix with GO / Mg in step (1). 2+ The materials are added to a ball mill with 50.0kgΦ=30mm zirconia balls in a certain order and circulated for 6 hours. During the circular grinding process, the temperature of the materials in the ball mill is controlled at 30°C; after the materials are evenly mixed, they are transferred to a high-purity nitrogen-protected spray In the d...

Embodiment 2

[0038] (1) Preparation of GO / Mn 4+ Material

[0039] Accurately weigh 6.0kg of water-based single-layer graphene emulsion with a particle size of 150-180nm 5%wt, 110.0g of manganese dioxide, and emulsify in the emulsification equipment for 1.5h. During the process, the temperature of the material is controlled at 45°C. Place in a spray drying equipment protected by an inert gas, and dry at a constant temperature of 320°C.

[0040] (2) Preparation of LiFePO 4 / GO / Mn 4+ Material

[0041] After accurately weighing 6.4kg of lithium carbonate, 8.0kg of ferrous oxalate, 3.7kg of phosphoric acid, and 40.0kg of deionized water, mix with GO / Mn in step (1). 4+ The materials are added to a ball mill with 75.0kgΦ=25mm zirconia balls in a certain order and circulated for 7 hours. During the circular grinding process, the temperature of the materials in the ball mill is controlled at 35°C; after the materials are evenly mixed, they are transferred to argon-protected spray drying. In th...

Embodiment 3

[0047] (1) Preparation of GO / Al 3+ Material

[0048] Accurately weigh 6.0kg of water-based graphene emulsion with a particle size of 120-160nm 5%wt, 203.0g of aluminum hydroxide, and emulsify in the emulsification equipment for 1h. During the process, the temperature of the material is controlled at 55°C. In the spray drying equipment protected by inert gas, it is dried at a constant temperature of 360°C.

[0049] (2) Preparation of LiFePO 4 / GO / Al 3+ Material

[0050] After accurately weighing 6.4kg of lithium carbonate, 8.0kg of ferrous oxalate, 3.7kg of phosphoric acid, and 32.0kg of deionized water, mix with GO / Al in step (1) 3+ The materials are added to a ball mill with 118.0kgΦ=35mm zirconia balls in a certain order and circulated for grinding for 6 hours. The temperature of the materials in the ball mill is controlled at 30°C during the circulation grinding process; after the materials are evenly mixed, they are transferred to a high-purity nitrogen-protected spray...

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Abstract

The invention discloses a preparation method of a LiFePO4 / GO / Mx+ / C composite. The method comprises the following steps of (1) preparing a GO / Mx+ material; (2) preparing a LiFePO4 / GO / Mx+ material; and (3) preparing the LiFePO4 / GO / Mx+ composite. According to the method, the pollution in a production process is less and the cost of the production materials is low; the LiFePO4 / GO / Mx+ / C composite has good physical and chemical performance, and the initial charge gram volume is high and is close to an LiFePO4 theoretical value; the initial charge-discharge efficiency is high and is not less than 98%, and the national standard is more than 92%; the tap density is high to help to improve the pole piece processing capability and the energy density of the lithium ion battery; and the ionic diffusion coefficient and the electronic conductivity are higher, and the high-rate charge-discharge capability of the material is good.

Description

technical field [0001] The invention relates to the field of lithium ion battery cathode materials, in particular to a LiFePO 4 / GO / M x+ / C composite material preparation method. Background technique [0002] With the increasingly prominent environmental problems, the research and development of new energy vehicles is imperative. As the power source of new energy vehicles, lithium-ion batteries have high energy density, working voltage and environmental friendliness, and are recognized as the secondary battery system that can best meet the medium and long-term development goals of new energy vehicles. For lithium-ion batteries, the cathode material is a key factor in determining its electrochemical performance and safety performance. [0003] At present, the main cathode materials suitable for lithium-ion batteries include spinel lithium manganese oxide, layered lithium cobalt oxide, layered ternary materials, and olivine-structured lithium iron phosphate. However, each ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/133H01M4/136H01M4/1393H01M4/1397H01M10/0525
CPCH01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/362H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 何鹏飞沈智郑拥军杨世近
Owner 湖南锂顺能源科技有限公司
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